Qihoo held its initial public offering on NASDAQ in March 2011 as QIHU. The company’s plans to go private after four years of trading in the U.S. were first revealed in June, when chairman and chief executive officer Zhou Hongyi said he wanted to lead a buyout. The final deal will give investors a premium of 16.6 percent to the closing price of Qihoo’s shares of $66.05 on June 16, the day before it was notified of Zhou’s offer.